Add a new tag to the game called “Bioelectric” or some such. Basically, a mutation that gives Fish Electroreception, or the ability to sense electrical fields. It’d have limited use on non Cyber-zombies, but it’d also be able to detect anything living because of the bio-electricity it gives off.
Or even better: Add both.
I think “Shark Jaw” should be added. From what I can tell, that was actually planned for Fish. Maybe Denticles, which would be like Quills?